16668536665 has 16 divisors (see below), whose sum is σ = 22096846080. Its totient is φ = 11969118720.

The previous prime is 16668536627. The next prime is 16668536789. The reversal of 16668536665 is 56663586661.

It is not a de Polignac number, because 16668536665 - 2¹³ = 16668528473 is a prime.

It is a super-2 number, since 2×16668536665² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1913784 + ... + 1922473.

It is an arithmetic number, because the mean of its divisors is an integer number (1381052880).

Almost surely, 2^16668536665 is an apocalyptic number.

It is an amenable number.

16668536665 is a deficient number, since it is larger than the sum of its proper divisors (5428309415).

16668536665 is a wasteful number, since it uses less digits than its factorization.

16668536665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3836352.

The product of its digits is 27993600, while the sum is 58.

The spelling of 16668536665 in words is "sixteen billion, six hundred sixty-eight million, five hundred thirty-six thousand, six hundred sixty-five".